Refactor named entity query to improve performance

[jacobwegner]

See description #54 and https://github.com/scaife-viewer/explorehomer-atlas/pull/63 for prior implementations.

The links below help to demonstrate the improved performance (you'll want to toggle on the Named Entities display mode):

• Passage with no named entities:

  • develop: https://explorehomer-dev.netlify.app/reader?urn=urn%3Acts%3AgreekLit%3Atlg0012.tlg001.perseus-eng4%3A1.1-1.160
  • this PR: https://perf-token-queries--explorehomer-dev.netlify.app/reader?urn=urn%3Acts%3AgreekLit%3Atlg0012.tlg001.perseus-eng4%3A1.1-1.160

• Passage with a large number of entiites

  • develop: https://explorehomer-dev.netlify.app/reader?urn=urn%3Acts%3AgreekLit%3Atlg0012.tlg001.perseus-eng4%3A2.480-2.840
  • this PR: https://perf-token-queries--explorehomer-dev.netlify.app/reader?urn=urn%3Acts%3AgreekLit%3Atlg0012.tlg001.perseus-eng4%3A2.480-2.840

[jacobwegner]

Reduce nested queries